IoA Seminar 2020 / 令和2年度/2020年度・東京大学・天文学教育研究センター・談話会

Upcoming Seminars

No. 366: 18 February 2021 (Thu) 15:30 - 16:30

Speaker: Dr. Maria Giovanna Dainotti (NAOJ)

Title:The Optical Luminosity-Time Correlation for More than 100 Gamma-Ray Burst Afterglows

Abstract: Gamma-ray bursts (GRBs) are fascinating events due to their panchromatic nature. Their afterglow emission is observed from sub-TeV energies to radio wavelengths. We investigate GRBs that present an optical plateau, leveraging on the resemblance with the X-ray plateau shown in many GRB light curves (LCs). We comprehensively analyze all published GRBs with known redshifts and optical plateau observed mostly by the Neil Gehrels Swift Observatory (Swift). We fit 267 optical LCs and show the existence of the plateau in 102 cases, which is the largest compilation so far of optical plateaus. For 56 Swift GRBs with optical and X-ray plateaus, we compare the rest-frame end time at both wavelengths ( Topt, TX ), and conclude that the plateau is achromatic between Topt and TX . We also confirm the existence of the two-dimensional relations between T?opt and the optical luminosity at the end of the plateau emission, which resembles the same luminosity-time correlation in X-rays (Dainotti et al. 2013). The existence of this optical correlation has been demonstrated for the largest sample of optical plateaus in the literature to date. The squared scatter in this optical correlation is smallest for the subset of the Gold GRBs with a decrease in the scatter equivalent to 52.4% when compared to the scatter of the entire GRB sample. Currently, we are investigating GRBs observed in high energies by the Fermi-LAT and we are looking for the existence of the plateau emission in these high energy GRBs. Thus, a joint analysis of GRBs observed by Fermi, Swift BAT+XRT X-rays and optical (Swift UVOT + SUBARU and other optical facilities) will provide additional insight on the nature of the plateau emission.

Language: English


本談話会について

趣旨

東京大学・天文学教育研究センターでは2003年4月から, 院生コロキウムに引き続き, 談話会を開いています. 第一線で活躍されている研究者の方々を講師にお招きし, 最先端の研究成果をお話しいただきます. 講師の方には, 大学院生の参加者のことも考慮し, レビュー的な側面も含めた上で, ご自身の研究紹介をお願いしています.

日時

場所

標準タイムテーブル

13:30-14:30院生コロキウム講義室
15:30-16:30談話会講義室
16:30-お茶の時間講義室横のお茶部屋~講師の方を交えて~

世話人

ML: semiadm _at_ ioa.s.u-tokyo.ac.jp

please replace _at_ with @

Schedule

#DateSpeakerTitleChair
3662021/02/18(Thu) 15:30 - 16:30Maria Giovanna Dainotti (NAOJ)The Optical Luminosity-Time Correlation for More than 100 Gamma-Ray Burst Afterglows (NAOJ)TM

終了した談話会(2020年度)

詳細はこちら: 令和2(2020)年度談話会

#DateSpeakerTitleChair
3592020/10/08(Thu) 15:30 - 16:30吳柏鋒 Wu, Po-Feng (EACOA Fellow/NAOJ)The blind men and the elephant: Multiple evolutionary paths from star-forming galaxies to quiescenceTT
3602020/10/15(Thu) 15:30 - 16:30行方宏介 Namekata, Kosuke (京都大学)Stellar superflares on late-type stars - recent results by 3.8-m Seimei telescopeTM
3612020/12/03(Thu) 15:30 - 16:30瀧田 怜 Takita, Satoshi (東京大学)「あかり」アーカイブデータTM
3622020/12/10(Thu) 15:30 - 16:30野田博文 Hirofumi, Noda (大阪大学)X線観測による巨大BH近傍の研究とXRISMを用いた展望HS
3632020/12/17(Thu) 15:30 - 16:30大澤亮 Ryou Ohsawa (東京大学)流星の観測から探る惑星間空間ダストTM
3642021/01/21(Thu) 15:30 - 16:30鮫島 寛明 Hiroaki SAMESHIMA (東京大学)クェーサーの輝線で探る宇宙の化学進化TM
3652021/01/28(Thu) 15:30 - 16:30浅野 健太朗 Kentaro ASANO (東京大学)The Near-Infrared Echelle Spectrograph NICE as a first light instrument for the TAO 6.5m telescopeHS

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